ANCHOR Russian patent published in 1996 - IPC

FIELD: mining. SUBSTANCE: anchor includes load carrying bar 1, nut 2 screwed on the bar end and eccentric clamping washer 3 and supporting washer 5 and cylindrical bushing 4 with eccentrically located longitudinal hole. Washer 3 is located between nut 2 and bushing 4 and coupled during installation of anchor with nut 2 by means of safety lock. The latter may be made in form of a pin installed in coaxial hollows of nut 2 and washer 3 and may be sheared at the limit force of tightening the bushing 4. Also possible is locks in form of flexible ratchet engaged with nut 2 and installed in washer 3 disengageable from nut 2 at the limit force of tightening of bushing 4. Bushing 4 is made of granulated materials filled with plastically deformed adhesive material. When assembled anchor is installed into borehole, bar 1 is screwed into movable nut 2 and washer 3 tightens bushing 4. Bushing granulated and adhesive materials are deformed to make side bracing. Thus, anchor is secured on borehole. When the limit force of tightening of bushing 4 is attained, lock disengages washer 3 from nut 2. This protects bar 1 from rupture or its thread stripping. This effect is realized, either, by pin shearing or by disengaging of ratchet from nut 2. EFFECT: increased loading capacity of anchor of anchor and reduced costs for its manufacture. 3 cl, 5 dwg